The biogeochemistry of phosphorous cycling and phosphorous availability along a desert soil chronosequence

TitleThe biogeochemistry of phosphorous cycling and phosphorous availability along a desert soil chronosequence
Publication TypeJournal Article
Year of Publication1988
AuthorsLajtha K, Schlesinger WH
JournalEcology
Volume69
Pagination24-39
Date Published1988
Accession NumberJRN00085
Call Number00169
Keywordsarticle, articles, biogeochemistry, calcium carbonate, journal, journals, nutrient cycling, phosphorous cycling, soil, chronosequence, soil, phosphorous, soil, SEE biogeochemistry, weathering
Abstract

The biogeochemistry of the weathering, landscape movements, and chemical transformations of phosphorus and its availability to plants were examined in a chronosequence of soils developed from quartz monzonite alluvium in southern New Mexico. Total P in the soil profile decreased with increasing soil age and was removed from the ecosystem as readily as the most easily leachable bas cations. Although Ca-bound forms of P decreased with increasing soil age, Ca-P remained the single largest fraction of total P in all soils. In contrast, Fe- and Al-bound P was a very small percent of total P in all soils. There was little evidence for the stabilization of P by soil organic matter within this ecosystem; both soil organic P and microbial P represented very small pools of total soil P. Phosphorus availability, measured by in situ resin bags, was not well correlated with soil age or total soil P, and P concentrations in shrub tissues did not reflect changes in forms or total amounts of soil P. The biogeochemical cycle of P in this system differs sharply from that in a more mesic, forested system, where fixation by iron and aluminum oxides and biological activity play more dominant roles in the conservation of P within the ecosystem.

URLfiles/bibliography/JRN00085.pdf
DOI10.2307/1943157